Probably something similar to the hard shell of a beetle or crab except having higher levels of metals like iron in the atomic structure instead of chitin (carbon, hydrogen, oxygen, and nitrogen) this is probably what they meant by “armor” for G1 or at least it’s my opinion They also probably wore traditional armor over there exoskeleton made of things like steel to protect themselves. do you think they molt?
That’s a disgusting thought…
That’s why the Toa have upgrades. 
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ACTUALLY, they are robots with brains and whatever in them.